The energy band in which free electrons exist is

The energy band in which free electrons exist is

Right Answer is:

Conduction band

SOLUTION

A large number of discrete but closely spaced energy levels is called an energy band. 

Out of all the energy bands, Three bands are most important to understand the behavior of solids. These bands are,

  1. Valence band,
  2. Conduction band
  3. Forbidden band or gap

Conduction Band:  The electrons occupying this band are called conduction electrons and the band is called the conduction band. This band can also be defined as the lowest unfilled energy band. This band may be empty or partially filled. In this band, electrons move freely.

The energy band in which free electrons exist is the conduction band.

Under normal conditions, the conduction band is empty and once energy is imparted, the valence electrons jump from the valence band to the conduction band and become free. While jumping from valence band to conduction band, the electrons have to cross an energy gap.

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